[clang-tools-extra] [clang-tidy][performance-unnecessary-value-param] Make `handleMoveFix` virtual (PR #99867)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL approved this pull request.

Please note that at any time in future those
functions could be changed no non-virtual again,
as there are no tests to guard this.

I'm fine with the change, as it provides tiny refactoring.

https://github.com/llvm/llvm-project/pull/99867